talking or singing in ONE tone of voice

describing something as boring because it's always the same

saying, doing, or singing something at the same time; doing it as ONE

imaginary creature looking like a horse with one straight horn

to cause or bring things together

describes something or someone that is unlike anything or anyone else; unusual

being alone--usually because you want to be alone

a performance or action done by ONE person

relating to the sun--of which there is only ONE